System calls

I am working on visual c++ 6.0.I have to compile and execute a program using system calls.(system command).Main program is compiling a program file using tcc system command.
The program is compiling without any errors or warnings but in my output window command prompt is appearing stopping the further execution.

Thanks 4r replying.
Actually I am working on the code which has to transfer files 4m one system to another.In main program i created a thread to accept that program file and then compile&run using TCC command.then i have to send the result file back to the system which sent that program file.

Everything is wrking is fine but after compiling program file it is just coming out of the main thread.

Can anyone help me?
I am working on visual c++6.0.(windows socket programming).I have 2 transfer the files from one system to another.I am using threads for this(CreateThread()).
The problem is i am not able to transfer all files,only some files are transferred.also different files are transferred each time i run.(file 1, 2,6 first time i run and files 2 4 7 transferred next time i run)
If i am using debugging mode i.e using f10 all files are transferred.

I forgot to mention one thing ,actually i'm passing the structure to the thread that trnsfers the file. this structure contains the information about the file.only some part of the structure is received by the thread,but other information is vanishing.I donot know how?